Dogs are Carnivores/Insectivores/Omnivores
<snip>Dogs are naturally carnivores<snip>
Actually, dogs are Carnivores/Insectivores/Omnivores (all three!).
Cats, however, are obligate carnivores.
There are many animals in the wild which are Carnivores/Insectivores/Omnivores:
Bears (incuding polar and Giant Panda)
and Wolves (as previously mentioned)
I'm not sure that we are necessarily "imposing morals" on our pets in deciding their diet. We are dictating what they eat, yes... hopefully that is determined by what is considered to be the most healthy for them. Dogs in the wild do not eat a stricly vegan diet, no. They also do not spend most of their days lazing about the house, eating regular meals, having vet visits, receiving vaccinations (a topic of debate for another discussion), and being told what to do... in essence, they do not live a domesticated life. So, we are imposing much more on our pets than simply what they eat.
The truth is, domesticated dogs no longer live a "natural" life, and haven't for a long time.
I have two dogs who have been vegan almost their entire lives. They are nine this year, and going strong.
We feed them a combination of foods we prepare, supplemented with pre-prepared foods. One of the pre-prepared foods is Dr. Harvey's Veg-to-Bowl for dogs, and we supplement their diet with various things (like different oils), all "human grade."
We recently visited a dog boutique, of sorts, that sells vegan dog treats (among a ton of other things) and the owner just told us about her 16-year-old Bichon who has also been vegan all of his life and is as spry as pup.
And I have a friend whose three rescued dogs who have been vegan since they were rescued (like ours). They are old and gray now, and still fit as fiddles.